Re: OT: Wireless Signal Strength

Hi Khurram,

1. What supplicant are you using? Windows or vendor? Try Windows if not.
2. If wireless driver is not the latest one, update the driver.
3. In order to isolate the problem, power-off the surrounding APs(including
upper floor and lower floor one), and then associate.
    If the problem still persist, it may not be the interference
problem...as your D-link router works fine.
4. If you are using Windows Vista or later, debug the wireless condition.

By the way, is this problem equally happens on 8th floor as well?

Best Regards,

2010/12/26 Khurram Noor <engr.khurramnoor_at_googlemail.com>

> HI Sogo,
> this client has a very poor antivirus solution and no patch management
> solution deployed..... so the possibility of malicious traffic is there.
> There are microwaves on each floor but in a closed pantry room, and the APs
> are much far from them. This problem has just started to come since last
one
> week.
>
> Regards,
> Khurram
> 2010/12/26 Shogo Kobayashi <k.shogo_at_gmail.com>
>
> Hi
>>
>> As long as RRM is properly working, the channel must be fine,,, if there
>> is no microwave or other things like in hospital...
>> Maybe signal is strong enough, but noise causes the slowness.
>>
>> Do you see any suspicious traffic going out from your client? Some of
>> vendor software sending lots of traffic once client connected to network.
>> And if you are using bluetooth on client, turn it off to see whether
problem
>> solves.
>>
>> Best Regards,
>>
>> On Sun, Dec 26, 2010 at 2:18 PM, Khurram Noor <
>> engr.khurramnoor_at_googlemail.com> wrote:
>>
>>> Dear all,
>>>
>>>
>>>
>>> I am having a strange problem with a client. He has around 25 access
>>> points
>>> installed in a 8 floor building. They are using cisco AP 1140 with 2 WLCs
>>> 5508 for management. Things were fine in the beginning but now the
>>> problem
>>> is with the signal strength. The signal bars on any system before
>>> connection
>>> shows excellent strength, but as soon as the system gets connected, the
>>> signal strength starts to decrease and becomes poor. this causes latency
>>> and
>>> timeout. Browsing becomes really slow and wireless users are suffering.
>>>
>>>
>>>
>>> Wireless Lan controller runs an algorithm called RRM, which automatically
>>> adjust Tx power, channel assignment and many other parameter. If there is
>>> someone in this group who know can tell what settings on WLC need to
>>> change.
>>> Could this be a result of some power issue on the catalyst 4500 switch
>>> which
>>> is a POE supported? Or is this some malware kind of thing?
>>>
>>>
>>> By the way wired users have no such problem (latency, delay etc)
>>>
>>> --
>>> Khurram Noor
>>>
>>>
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>>>
>>
>>
>> _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
>> $p*L 39'^ Shogo KOBAYASHI
>> k.shogo_at_gmail.com (e-mail)
>>
>
>
>
> --
> Khurram Noor
> CCIE # 24419
>
> http://www.linkedin.com/in/khurramnoor
>

--
_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
$p*L 39'^ Shogo KOBAYASHI
k.shogo_at_gmail.com (e-mail)
skype name: shogo2022
Blogs and organic groups at http://www.ccie.net